High Quality Compact Design, Easy To Keep Your Battery Safe From Loose Change/Keys, Conveniently Store Either 2 18650 or 4 18350 Batteries. Get this ultra convenient and portable two battery case. Bring it with you on the go, in your carry on for the airport, anything. This is a great way to practice battery safety by storing your batteries in this case while travelling. Efest makes incredible products and we know that you will enjoy the affordability and quality that you get from purchasing this particular product. Enjoy!